| Jacob Gandzjuk | Jacob Gandzjuk | — | (714) 913 0835 | Electricians | Corona · Riverside County | — | — |
| Jacob Henry Harris DBA Jacob's Ladder Construction | Jacob Henry Harris | — | (951) 956 1991 | GC, remodel, ADU | Moreno Valley · Riverside County | — | — |
| Jacob Kenneth Kim | Jacob Kenneth Kim | — | (951) 310 9854 | Other | Corona · Riverside County | — | — |
| Jacob Lopo Tile Install | Jacob Lopo Tile Install | — | (951) 837 7780 | Other | Temecula · Riverside County | — | — |
| Jacob Rock INC | Jacob Aubert Rock | — | (951) 232 9188 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Jacob Rubnerth | Jacob Rubnerth | — | (714) 606 7674 | Other | Lake Elsinore · Riverside County | — | — |
| Jacobo & Son's Drywall | Carlos Hector Jacobo | — | (951) 206 4552 | Other | Norco · Riverside County | — | — |
| Jacobos Caulking & Waterproofing INC | Angelica Ramirez | — | (714) 808 3003 | Other | Norco · Riverside County | — | — |
| Jacobs Construction | Jake Roy Jacobs | — | (714) 824 0112 | GC, remodel, ADU | Bermuda Dunes · Riverside County | — | — |
| Jacobs Landscape Services INC | Autumn Marie Jacobs | — | (951) 776 4004 | Windows, patio, painters | Riverside · Riverside County | — | — |
| Jacobs/pcl A Sf Joint Venture | Project Management Co Jacobs | — | (213) 228 8286 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Jacobsson Engineering Construction INC | Erik Daniel Jacobsson | — | (760) 345 8700 | GC, remodel, ADU | Palm Desert · Riverside County | — | — |
| Jacques De Groot | Jacques De Groot | — | (818) 489 9288 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| Jada Construction | Jason Allan Martin | — | (714) 267 4937 | GC, remodel, ADU | Corona · Riverside County | — | — |
| Jade Improvements | Jade Improvements | — | (951) 880 6847 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Jade Window Coverings | Jade Window Coverings | — | (951) 437 1227 | Other | Lake Elsinore · Riverside County | — | — |
| Jaeger Metal Fab & Concept | Jaeger Metal Fab & Concept | — | (760) 342 4147 | Other | Indio · Riverside County | — | — |
| Jag Landscape INC | Jose Guadalupe Aguilera | — | (760) 578 4180 | Windows, patio, painters | Indio · Riverside County | — | — |
| Jag Stone INC | Jeffrey Alan Garrison | — | (760) 578 9227 | Other | Desert Hot Springs · Riverside County | — | — |
| Jaguar Metal Industries INC | Fernando Sanchez | — | (951) 486 1358 | Other | Moreno Valley · Riverside County | — | — |
| Jahnig Construction INC | Alma Ignacia Jahnig | — | (858) 869 5017 | GC, remodel, ADU | Indio · Riverside County | — | — |
| Jaiden's Plumbing INC | Michael Tyrone Jones | — | (310) 689 4059 | Other | Eastvale · Riverside County | — | — |
| Jaime Arredondo | Jaime Arredondo | — | (951) 452 0228 | Other | Menifee · Riverside County | — | — |
| Jaime Bill Garcia | Jaime Bill Garcia | — | (661) 233 4201 | Other | Canyon Lake · Riverside County | — | — |
| Jaime Chacon | Jaime Chacon | — | (760) 660 5432 | HVAC | Desert Hot Springs · Riverside County | — | — |
| Jaime Construction | Juan Angel Jaime | — | (951) 452 2006 | GC, remodel, ADU | Menifee · Riverside County | — | — |
| Jaime Enrique Arreguin | Jaime Enrique Arreguin | — | (760) 449 7221 | Other | Cathedral City · Riverside County | — | — |
| Jaime Garcia Masonry | Jaime Garcia Masonry | — | (760) 668 7302 | Other | Cathedral City · Riverside County | — | — |
| Jaime Jimenez Acevedo | Jaime Jimenez Acevedo | — | (760) 469 6349 | Windows, patio, painters | Cathedral City · Riverside County | — | — |
| Jaime Leyva | Jaime Leyva | — | (310) 989 5027 | Other | Riverside · Riverside County | — | — |
| Jaime Maure Flores | Jaime Maure Flores | — | (626) 362 8711 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Jaime Torres Collazo | Jaime Torres Collazo | — | (951) 966 2233 | Other | Hemet · Riverside County | — | — |
| Jaime's Concrete Restoration INC | Precious Breanna Castro Lozano | — | (760) 534 1451 | Restoration | Palm Springs · Riverside County | — | — |
| Jaimes Gardening & Landscaping Services | Saul Ivan Quiterio Hernandez | — | (909) 986 6785 | Windows, patio, painters | Jurupa Valley · Riverside County | — | — |
| Jaimo Construction | Jomari Angelo Manaloto Ocampo | — | (951) 692 9949 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| Jake's Heating & Air | Jake's Heating & Air | — | (909) 379 9656 | HVAC | Moreno Valley · Riverside County | — | — |
| Jakov Balov Construction | Balov Jakov | — | (760) 288 7345 | Other | Desert Hot Springs · Riverside County | — | — |
| Jam Construction | Justin Aaron Mcdaniel | — | (760) 239 8983 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| James Anderson | James Anderson | james@james-anderson.com | (951) 235 6680 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| James B Murphy Jr | James B Murphy Jr | — | (951) 235 9869 | Other | Corona · Riverside County | — | — |